Jaeger-LeCoultre Deep Sea Alarm Steel

An early automatic dive watch with an alarm. Released in 1959, the Deep Sea Alarm, reference E857, was the first automatic diver's wristwatch with an alarm: instead of a rotating bezel, a vibrating alarm on the calibre 815 told a diver when to head for the surface. Two dials exist, an American one signed LeCoultre with no lume, and a European one signed Jaeger-LeCoultre. It is distinct from the later Polaris and the dress Memovox.